[Rpm-maint] [rpm-software-management/rpm] Make use of %apply_patch easier (#1357)

[Vít Ondruch]

I need to use git to apply binary patch. Therefore I thought about using `%apply_patch` and I ended up using the following:

~~~
%global __scm git_am
%{expand:%__scm_setup_%{__scm}}
%apply_patch -p1 %{PATCH4}
~~~

This is suboptimal, because I believe that the doubleunderscore macros are implementation detail and should not be used. You might admit that I should use `%autosetup` but I can't use it, because this is the current `%setup` line:

~~~
%setup -n %{gem_name}-%{version} -b 1 -b 3
~~~

i.e. it expands more sources prior expanding the main source and I don't think this is supported by %autosetup. So I have to keep using the `%setup`.

So I thinking about two possible extensions:

1. Allow to disable the `%setup` call from `%autosetup`.
2. Providing something like `%setup_scm` which would actually do the necessary setup for `%apply_patch`.

Please also note that on top of that, I actually need to apply patches in the `%{_builddir}`, so the current implementation is very limiting.

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https://github.com/rpm-software-management/rpm/issues/1357
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